Yes if they qualify as your dependents. But if they qualified as dependents in 2020 too you all filed wrong. You really don't have the choice. If they qualify as a dependent they have to file as dependent even if you don't claim them.
Then if you claim them this year you will also get the Recovery Rebate Credit for them even if they already got the 3rd Stimulus payment. It is really based on 2021. And they don't have to pay theirs back. The IRS just used 2020 returns to send the checks out fast.
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